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如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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A) 从参与股市的人员看，股市博弈的本质是多方博弈；
B) 从参与人员的目标看，“股市博弈的本质是两方博弈”，即看跌卖出的空方和看涨买入的多方进行博弈；
C) 股市博弈的本质和下棋很相似，有人说股市如棋，此言甚是...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...新知识的那种动力，可能在大多数的人眼里，php是专为web而生，做wep app是一流的快速好用，并极易简单和容易上手，做起web所需的各项功能可能是分分钟搞定，然后做socket了？可能就觉得不屑一顾了，好像是不务正业，用了自...
Python Pandas merge only certain columns
Is it possible to only merge some columns? I have a DataFrame df1 with columns x, y, z, and df2 with columns x, a ,b, c, d, e, f, etc.
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How do you reindex an array in PHP?
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If you need it to start at one, then use the following:
$iOne = array_combine(range(1, count($arr)), array_values($arr));
Here are the manual pages for the functions used:
array_values()
array_combine()
range()
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What is unit testing and how do you do it? [duplicate]
...ning Unit Testing
How to properly mock and unit test
Unit Testing: Beginner Questions
And many more ...
Also, Google for site:stackoverflow.com "how do you" unit-test
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Resizing an Image without losing any quality [closed]
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As rcar says, you can't without losing some quality, the best you can do in c# is:
Bitmap newImage = new Bitmap(newWidth, newHeight);
using (Graphics gr = Graphics.FromImage(newImage))
{
gr.SmoothingMode = SmoothingMode.HighQuality;
gr.InterpolationMode = InterpolationMode...
getResourceAsStream returns null
...().getResourceAsStream(...) loads resources using system class loader, it obviously fails because it does not see your JARs
Lifepaths.class.getResourceAsStream(...) loads resources using the same class loader that loaded Lifepaths class and it should have access to resources in your JARs
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JavaScript loop through json array?
...the Array like this:
for(var i = 0; i < json.length; i++) {
var obj = json[i];
console.log(obj.id);
}
Or like this (suggested from Eric) be careful with IE support
json.forEach(function(obj) { console.log(obj.id); });
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What is a practical use for a closure in JavaScript?
...tion = function () {
alert('hello');
}
return {
publicfunction : function () {
privatefunction();
}
}
})();
As you can see there, a is now an object, with a method publicfunction ( a.publicfunction() ) which calls privatefunction, which only exists ...
How to edit log message already committed in Subversion?
Is there a way to edit the log message of a certain revision in Subversion? I accidentally wrote the wrong filename in my commit message which could be confusing later.
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